Pulsatility imaging of saccular aneurysm model by 64-slice CT with dynamic multiscan technique

Area of Science:

• Medical Imaging
• Radiology
• Biomedical Engineering

Background:

• Aneurysms pose significant risks, and accurately assessing their pulsatility is crucial for understanding rupture potential.
• Current imaging techniques may have limitations in capturing dynamic pulsatile behavior within aneurysms.
• High-resolution imaging modalities offer potential for improved visualization of vascular dynamics.

Purpose of the Study:

• To evaluate the feasibility of imaging pulsatility in an aneurysm model using a high-resolution dynamic multiscan technique with 64-slice computed tomography (CT).
• To assess the ability of the technique to visualize dynamic wall motion in a pulsatile aneurysm phantom.
• To determine if cardiac gating is necessary for artifact-free pulsatility imaging.

Main Methods:

• A pulsatile aneurysm phantom was constructed and filled with iodinated contrast material.
• The phantom was imaged using a 64-slice CT scanner with a dynamic multiscan technique.
• Specific parameters included a 0.33-second gantry rotation time, 1.2 mm slice thickness, 24 mm effective coverage, and a 4-second total imaging time.
• Images were reconstructed at 50-millisecond intervals for dynamic analysis.

Main Results:

• The high-resolution dynamic multiscan CT technique successfully visualized pulsatility within the aneurysm model.
• Qualitative evaluation confirmed the visualization of wall motion by comparing four-dimensional images with phantom motion.
• The imaging technique achieved pulsatility imaging without perceptible artifacts.
• Cardiac gating was not required for successful pulsatility imaging.

Conclusions:

• High-resolution dynamic multiscan CT is a feasible technique for imaging pulsatility in aneurysm models.
• This method allows for the visualization of dynamic wall motion without significant artifacts.
• The technique's ability to function without cardiac gating simplifies the imaging process for aneurysm assessment.